The US Department of Defense has identified four possible military courses of action that China could take against Taiwan, but did not offer any guess on when Beijing might be ready to act.

In an annual report to the US Congress released on Tuesday titled Military and Security Developments Involving the People’s Republic of China 2022, the department gave a broad overview of China’s military capabilities, strategy, ambitions and intentions.

The report devoted significant space to developments related to Taiwan, against which it said China had intensified diplomatic, economic, political and military pressure last year.